The Art of Application Performance Testing Quotes

“In the AJAX world, a client can make a request, the server responds that it has received the request (so the client can get on with something else), and then at some random time later the actual response to the original request is returned. You see the problem? It becomes a challenge to match requests with the correct responses. From a programming standpoint, the performance tool must spawn a thread that waits for thecorrect response while the rest of the script continues to execute. A deft scripter may
be able to code around this, but it may require signifcant changes to a script with the
accompanying headache of ongoing maintenance. The reality is that not all testers are bored developers, so it’s better for the performance tool to handle this automatically.”
― Ian Molyneaux, The Art of Application Performance Testing: Help for Programmers and Quality Assurance

“Making use of AJAX in your application design removes this potential logjam and can lead to a great end-user experience.
The crux of the problem is that automated test tools are by default designed to work in
synchronous fashion.”
― Ian Molyneaux, The Art of Application Performance Testing: Help for Programmers and Quality Assurance

“Of course, the web servers are not always the cause of the problem. I have seen many
cases where virtual users timed out waiting for a web server response, only to fnd that
the actual problem was a long-running database query that had not yet returned a
result to the application or web server tier. This demonstrates the importance of setting
up KPI monitoring for all server tiers in the system under test (SUT).”
― Ian Molyneaux, The Art of Application Performance Testing: Help for Programmers and Quality Assurance

“One only needs two tools in life: WD-40 to make things go, and duct tape to make them stop. G. Weilacher”
― Ian Molyneaux, The Art of Application Performance Testing: From Strategy to Tools

“If an end user perceives bad performance from your website, her next click will likely be on your-competition.com.”
― Ian Molyneaux, The Art of Application Performance Testing: From Strategy to Tools